*matches any number of characters from the set below:
Athe literal A (6510 / 1018 / 4116) (case sensitive)
Bthe literal B (6610 / 1028 / 4216) (case sensitive)
Cthe literal C (6710 / 1038 / 4316) (case sensitive)
Dthe literal D (6810 / 1048 / 4416) (case sensitive)